1.The practical problem: molecules often have activity, but lack a “developable property window”
In many R&D programs, the bottleneck is not “whether a molecule does something,” but whether it can work stably and controllably in real systems—i.e., whether it falls within a developable property window, such as:
1. Insufficient solubility: formulation becomes difficult, dose is limited, and in vivo exposure is inadequate.
2. Excessive lipophilicity/partitioning (e.g., high logD at pH 7.4): non-specific binding increases, tissue distribution becomes harder to control, and safety risk rises.
3. Clearance is too fast (over-strong metabolism/efflux): effective exposure cannot be maintained.
4. Excessive molecular flexibility (too many conformations): binding modes and selectivity become more variable, and reproducibility becomes harder.
These problems often call for small changes that adjust properties predictably, rather than starting over. Oxetane is frequently used in medicinal chemistry because it is a very small yet relatively polar four-membered ring module. It is commonly used to fine-tune key properties—solubility, logD, clearance/metabolism, and conformational preference—without significantly increasing molecular size. These trends are often collectively referred to as the “oxetane effect.”
It is important to emphasize that these effects depend on how oxetane is connected, where it is placed, and what surrounds it in the molecule. It can deliver clear benefits, but it may also introduce new risks (e.g., metabolism, permeability, or efflux liabilities), so experimental validation is still required.
2.Basics: what is oxetane, and how is it different from “epoxide/THF”?
Oxetane is a four-membered saturated oxygen heterocycle: the ring contains one oxygen atom and three carbon atoms (typically 3×CH₂), all connected by single bonds. In functional-group terms, it is a cyclic ether (a four-membered ring ether).
Oxetane has ring strain on the order of ~106 kJ·mol⁻¹. Therefore, when activated under acidic or Lewis-acidic conditions, ring-opening reactions (including cationic ring-opening polymerization) have a clear thermodynamic driving force. However, under neutral conditions without strong activation, it typically behaves as a kinetically stable cyclic ether fragment—it can be isolated, stored, and used as a structural module.
2.1 A simple side-by-side comparison of three common oxygen-containing rings
Ring size | Representative structure | Reactivity & property features | Quick mnemonic |
3-membered ring | Epoxide (oxirane) | Highest ring strain; more sensitive to nucleophiles; often opens more readily (high reactivity—can “wake up” even under mild conditions) | “Smaller, tighter, opens more easily” |
4-membered ring | Oxetane | Strained but more controllable: in most cases can serve as a relatively stable cyclic ether fragment; under suitable conditions/activation it can also undergo selective ring opening as a synthetic intermediate | “Small and polar; controllable; often used for fine property tuning” |
5-membered ring | Tetrahydrofuran (THF) | Lower strain; under typical synthesis/storage conditions behaves more like a conventional cyclic ether and is overall more inert; still can be activated under strong acid/strong Lewis acid or in cationic polymerization systems to ring-open/polymerize | “More like a conventional ether” |
Two key property “labels” for oxetane:
1. Hydrogen-bonding role: the oxetane oxygen is a hydrogen-bond acceptor; oxetane itself provides no hydrogen-bond donor (unless the molecule contains –OH/–NH elsewhere).
2. A neutral but more polar 3D fragment: it is often used to increase local polarity and reduce hydrophobic tendency without introducing an ionic center, while also adding more pronounced sp³ character / three-dimensionality.
3.Structural features: three major effects commonly associated with oxetane
What you change structurally | Often-observed property changes | Why it matters for R&D | Key validation points to watch |
Replace a hydrophobic “filler block” (e.g., gem-dimethyl, some hydrophobic alkyl/cycloalkyl fragments) with oxetane | Common trend: lower logP/logD and increased polarity/water solubility; consequently, linked changes may appear in exposure, clearance, protein binding, and metabolic pathways (magnitude depends on connection/position and nearby functional groups) | Without materially changing size, it can pull properties back from “too hydrophobic/too insoluble” into a usable window, while retaining some spatial occupancy and hydrophobic filling | Higher polarity may reduce membrane permeability, alter tissue distribution, and lead to no gain—or even a drop—in systemic exposure. This should be validated in an integrated readout set: solubility + PAMPA/Caco-2 + permeability/efflux ratio + CLint/CL + AUC. |
Use oxetane as a tunable side-chain fragment (attach it without changing the core scaffold) | More often provides fine tuning of logD/solubility/exposure and clearance; may also affect apparent pKa, but usually as a secondary effect depending on distance to ionizable sites, conformation, and solvation (must be measured) | Enables iterative, interpretable property optimization via side chains while keeping the “active core” unchanged; well-suited to systematic SAR and reclaiming a workable process/property window | Risk of “over-tuning”: too polar → permeability drops, P-gp efflux increases; may also introduce new metabolism/stability issues. Recommended as a fixed validation package: solubility/stability + permeability/efflux + CLint/CL + exposure |
Build oxetane into a spiro/fused ring to contribute to conformational locking | Reduced conformational freedom; binding conformations become more concentrated; for conformation-sensitive targets may improve selectivity and stability of activity, and increase 3D character | Helps shift optimization from “trial-and-error” to “iteration around a conformational hypothesis,” improving interpretability and reproducibility (especially where stereofit/conformational gating is strong) | Higher synthetic complexity and route constraints; locking can also reduce pocket adaptability (“locked too rigid”). Monitor in parallel: conformational/stereochemical evidence (calculation + NMR/crystal) + activity/selectivity + solubility/permeability |
4.How to choose: classify oxetane by the “problem you need to solve”
R&D task | More commonly used oxetane formats (structural implementation) | What to validate first |
Lower hydrophobicity and bring solubility/logD/exposure back into range without noticeably increasing size | Peripheral (side-chain) oxetane introduced as a neutral polar fragment, or used to replace hydrophobic filler blocks (e.g., replacing some alkyl/cycloalkyl or gem-dimethyl fragments) | Solubility (kinetic/equilibrium) + logD + permeability/efflux (PAMPA/Caco-2) + CLint/CL and AUC; with particular attention to the risk that higher polarity → lower permeability → worse exposure rather than improvement. |
Keep the core pharmacophore unchanged and perform “engineering-style micro-tuning” (influence properties while minimizing disruption to binding mode) | Peripheral (side-chain) oxetane used as a replaceable outer fragment for SAR | Activity retention + linked ADME readouts (solubility, logD, permeability/efflux, clearance/exposure). pKa/salt form may shift, strongly position-dependent: distal placement is often indirect; adjacent placement or incorporation into a spiro-aza-oxetane framework may be more pronounced—use measured data as the reference. |
Reduce conformational freedom to improve selectivity/reproducibility (conformation-sensitive targets; strong stereofit requirements) | Spiro/fused oxetane incorporated into the main scaffold to form a more rigid 3D framework | Conformational evidence (calculation/NOE/crystal, etc.) + stability of activity/selectivity; also assess synthetic accessibility and the risk of reduced fit due to “over-locking” |
Use oxetane as a “ring-openable module/synthetic building block” (subsequent conversion into a chain segment or installation of 1,3-functionalization) | Functionalized oxetanes bearing activation handles that can ring-open under triggered conditions (e.g., leaving groups or substituents that can be activated) | Reaction condition window (acid/Lewis acid/nucleophile/solvent) + selectivity and side reactions; clarify that the target is the post–ring-opening 1,3-functionalized chain/oxygen-containing chain segment, and verify controllability first at small scale |
5.Typical use cases: where do you usually encounter oxetane?
Setting | How to interpret this setting |
A. Drugs and clinical candidates | When oxetane appears in a drug-like molecule, it usually indicates a structural fragment that has been validated in practice. In the literature, discussion often focuses on how much this four-membered ring contributes to conformation/interactions and overall properties within a given scaffold. A common approach is to use “ring-opened / ring-modified / ring-replaced” analog comparisons to define its role. A classic example is the oxetane D ring in taxanes (e.g., paclitaxel), which has long been used as a representative case in structure–activity relationship discussions. Another “real-world translation” example is Wayrilz (rilzabrutinib), which has been FDA-approved for persistent or chronic ITP in adults. |
B. Synthetic chemistry (method development / route design / building blocks) | In synthesis and methodology papers, oxetane typically appears under two themes: (1) how to construct four-membered oxygen heterocycles (ring-forming methods), and (2) how to leverage oxetane for downstream transformations (ring-opening/functionalization under specific conditions). Among ring-forming routes, the Paternò–Büchi photochemical reaction is one of the classics. IUPAC defines it as a photochemical cycloaddition of an excited carbonyl compound to an alkene to form an oxetane. |
C. Materials chemistry (cationic UV curing: coatings / inks / adhesives) | In UV-curable formulation work, a common statement is that “oxetane monomers/resins are used in cationic ring-opening polymerization,” often discussed alongside epoxy systems as part of a mature family of formulation monomers. The focus is typically on curing behavior and formulation-level performance trade-offs (e.g., cure rate, shrinkage, adhesion/mechanical properties), rather than treating oxetane as a “universal additive” that guarantees improvements in a single metric. |
6.Product navigation table｜Quickly locate Tables 1–4 by “research task / experimental scenario” (Oxetane)
Research task / experimental need | Recommended table to start with | Why start here | Common next-step linkages |
Need the “minimal oxetane fragment” as a reference for reactivity/spectra/method benchmarking (or as a parent-monomer reference for cationic ring-opening polymerization) | Table 1 — Core scaffolds & 3D frameworks | Table 1 concentrates on parent cores / foundational frameworks (trimethylene oxide, substituted cores, spiro frameworks) to establish baseline behavior (reactivity, stability, polarity/size differences) | For downstream derivatization → Table 2 / Table 3; for functional-group transformation entry points → Table 4 |
Medicinal-chemistry SAR: want to “use oxetane as a property knob” and attach it onto an existing scaffold (fastest way to generate a series) | Table 2 — Leaving-group / halogenated / bifunctional connection building blocks | Table 2 provides the most common electrophilic installation reagents (bromomethyl/chloromethyl, OTs). A one-pot SN2 can attach an oxetane fragment to O/N/S nucleophiles—often the fastest route to “get the fragment in” | If you need a terminal handle for further growth (amine/alcohol) → Table 3; if you want to install via C–C coupling → Table 4 (boronate esters) |
Build a “linker / probe / dual-ended connector”: one end couples to A first, then the other end couples to B (stepwise assembly) | Table 3 — Amine/alcohol/polyol end-group building blocks | Table 3 focuses on amines/alcohols/diols and halo + alcohol bifunctionals, which are better suited for stepwise assembly, probe linkers, and controlled two-end derivatization | If you want the “other end” to be a stronger leaving group for re-coupling → Table 2; if you want fast amine installation via carbonyl reductive amination → Table 4 (aldehydes/ketones) |
Need systematic expansion via amide/ester formation (acid handle is broadly compatible; rapid library build / salt formation / prodrug thinking) | Table 4 — Carboxylic acids / carbonyls / nitriles / boronates + polymerizable/functional monomers | Table 4 includes carboxylic acids and their salts (the most universal coupling handle), enabling rapid derivatization via EDC/HATU, etc.; also suitable for salt-form screening and solubility-window optimization | If you also want to compare side-chain “installation modes” (SN2 vs amide coupling) → link Table 2 / Table 3 as paired controls |
Need a “carbonyl entry” for rapid amine installation (reductive amination is fastest), or to expand substituent space via organometallic addition | Table 4 — Carboxylic acids / carbonyls / nitriles / boronates + polymerizable/functional monomers | Aldehydes/ketones in Table 4 are among the most common diversification entry points: reductive amination and nucleophilic addition followed by further transformations enable fast expansion around substituent space | If you want to convert newly formed amines/alcohols into more general-purpose linkers → Table 3; if you want a leaving-group route as a control → Table 2 |
Need to connect oxetane to aryl/heteroaryl via Suzuki or other C–C cross-couplings, using a more stable carbon-framework linkage | Table 4 — Carboxylic acids / carbonyls / nitriles / boronates + polymerizable/functional monomers | Oxetane boronate esters in Table 4 are standard coupling blocks, ideal for building stable aryl/heteroaryl + oxetane C–C link series as controlled comparisons | If you also want to append an additional side chain via SN2 (two-dimensional SAR) → Table 2 / Table 3 |
Materials/formulation work: need polymerizable or post-modifiable functional monomers (UV curing, coatings/adhesives, network structures) | Table 4 — Carboxylic acids / carbonyls / nitriles / boronates + polymerizable/functional monomers | Table 4 includes methacrylated oxetanes and allyl/methylene-functionalized oxetanes, aligning with a materials workflow of “polymerize/cure first, then post-modify or tune performance” | To compare how “parent vs substituted oxetane” affects Tg/polarity → Table 1; for difunctional crosslinking points → Table 2 / Table 3 |
Need a “more rigid, more 3D” nitrogen-containing scaffold for lead optimization (replacing flatter/more flexible amine fragments) | Table 1 — Core scaffolds & 3D frameworks | Spiro-oxetane amine frameworks in Table 1 are classic conformational rigidity / 3D knobs, often used to reduce flexibility, tune pKa/solubility, and improve structural interpretability in lead optimization | To further convert the scaffold into amides/sulfonamides/ureas → Table 3 (amine handle) or Table 4 (acid handle / coupling entry) |
You already have a mature fragment, but want a “control set”: change only the oxetane substitution (unsubstituted vs methyl/ethyl/dimethyl) to observe property differences | Table 1 (priority) + Table 3 (common end-group variants) | Table 1 provides substituted parent cores as size/hydrophobicity knobs; Table 3 provides corresponding substituted alcohol/amine variants that are convenient for parallel synthesis and property comparisons | If you need faster installation onto the same scaffold for parallel controls → Table 2 (substituted halides); if you need acid-end controls → Table 4 (substituted carboxylic acids) |
Route not decided yet: you only know “I need an oxetane fragment,” but haven’t chosen SN2 vs amide coupling vs reductive amination vs cross-coupling | Start with Table 2 (fastest) or Table 4 (most entry types) | Table 2 is best for “fastest fragment installation”; Table 4 covers multiple entry modes (acid/carbonyl/coupling), making it easier to match your existing functional groups to a reaction strategy | If your substrate is an alcohol/phenol/thiol/amine → Table 2; if your substrate is an aryl halide / boronic system → Table 4; if you need linker end-groups → Table 3 |
Usage tips:
First identify the functional groups on your substrate. If you have a nucleophile (alcohol/phenol/amine/thiol), start with Table 2. If you plan amide coupling / reductive amination / cross-coupling / polymerization, start with Table 4. If you need linker end-groups and stepwise assembly, use Table 3. If you need scaffold controls and rigid spiro frameworks, use Table 1.
Table 1｜Core scaffolds & 3D frameworks (basic fragments / spiro framework controls)
Category | CAS No. | Aladdin Cat. No. | Name | Spec / Purity | Key features & applications |
Parent core / monomer｜Oxetane itself (strained small-ring reference / polymerizable monomer) | 503-30-0 | Trimethylene Oxide | ≥98% (GC) | The most basic oxetane parent core (strained cyclic ether): commonly used as a reference for ring strain/reactivity benchmarking, and also as a monomer and methodological reference substrate for cationic ring-opening polymerization. | |
Parent core / monomer｜Substituted oxetanes (fragment/monomer controls) | 6921-35-3 | 3,3-Dimethyloxetane | ≥98% | A substituted oxetane with small size but higher hydrophobicity: useful as a fragment control (size/hydrophobicity knob), and also a starting point for functionalized oxetane monomers/intermediates. | |
Spiro scaffold｜Oxetane–aza spirocycle (rigid, 3D; pKa/solubility tuning) | 174-78-7 | 2-Oxa-6-azaspiro[3.3]heptane | ≥97% | A commonly used “spiro-oxetane amine” saturated scaffold: employed to replace flatter/more flexible amine fragments to increase conformational rigidity and 3D character; frequently used in lead optimization to tune logP/pKa and reduce metabolic liabilities/hotspots. | |
Spiro scaffold｜Oxetane–aza spirocycle salt (easier handling/storage; salt-form screening) | 1429056-28-9 | 2-Oxa-7-azaspiro[3.5]nonane hemioxalate | ≥97% | The hemioxalate salt form is easier to handle and supports salt-form studies; used to build spiro-oxetane-containing amine derivatives (amides/sulfonamides/ureas, etc.) for property-window optimization and conformational control comparisons. |
Table 2｜Leaving-group / halogenated / bifunctional connection building blocks (SN2 installation and dual-end linking)
Category | CAS No. | Aladdin Cat. No. | Name | Spec / Purity | Key features & applications |
Haloalkyl building block｜Bromomethyl oxetane (SN2 installation of an oxetanyl side chain) | 939759-23-6 | 2-(Bromomethyl)oxetane | ≥97% | A typical “oxetanylmethyl electrophilic installer”: undergoes SN2 with nucleophiles such as alcohols/phenols/thiols/amines to rapidly append an oxetane side chain (commonly used in medicinal-chemistry SAR and materials side-chain grafting). | |
Haloalkyl building block｜Chloromethyl oxetane (SN2 installation of an oxetanyl side chain) | 87498-55-3 | 3-(Chloromethyl)oxetane | ≥97% | A commonly used oxetanylmethyl electrophilic building block for attaching an oxetane fragment to O/S/N nucleophiles; the chloride is milder and often easier to control for side reactions and scale-up. | |
Haloalkyl building block｜Bromomethyl oxetane (SN2 installation of an oxetanyl side chain) | 1374014-30-8 | 3-(Bromomethyl)oxetane | ≥97% | A classic general-purpose electrophilic building block: couples with phenols/alcohols/amines/thiols to quickly introduce oxetanylmethyl; often used to graft a “polar + 3D” fragment onto lead scaffolds. | |
Haloalkyl building block｜Chloromethyl, methyl-substituted oxetane (a more sterically congested side-chain variant) | 822-48-0 | 3-(Chloromethyl)-3-methyloxetane | ≥98% (GC) | An oxetane installer with a quaternary carbon / higher steric congestion: used to build more metabolically robust, more three-dimensional side chains and to compare property differences versus unsubstituted oxetanylmethyl. | |
Haloalkyl building block｜Bromomethyl, methyl-substituted oxetane (more reactive electrophile) | 78385-26-9 | 3-(Bromomethyl)-3-methyloxetane | ≥97% | Suitable when faster SN2 is needed: enables rapid installation of a methyl-substituted oxetanylmethyl side chain (commonly used for SAR and metabolic-stability comparisons). | |
Bifunctional electrophilic building block｜3,3-Bis(chloromethyl)oxetane (two-point linking / polymer side-chain) | 78-71-7 | 3,3-Bis(chloromethyl)oxetane | ≥97% | Two chloromethyl sites enable double substitution (bis-nucleophile SN2) to build bifunctional linkers/crosslinking points; also widely used as a key intermediate in functional poly(oxetane)-related studies. | |
Bifunctional electrophilic building block｜3,3-Bis(bromomethyl)oxetane (higher reactivity) | 2402-83-7 | 3,3-Bis(bromomethyl)oxetane | ≥98% | Compared with the chloride, the bromide undergoes SN2 more readily: used for rapid introduction of two terminal functional groups (bifunctional linkers, dendritic/crosslinked structures, or multi-site derivatization). | |
Leaving-group building block｜p-Toluenesulfonate ester (a more stable “activated alcohol” equivalent) | 26272-83-3 | 3-Oxetanyl p-Toluenesulfonate | ≥98% (GC) | Oxetanyl-OTs is an excellent leaving group: used for SN2 installation of oxetanyl units with N/O/S nucleophiles; compared with halides, it is often easier to derive from the corresponding alcohol and can improve reaction controllability. |
Table 3｜Amine / alcohol / polyol end-group building blocks (coupling / linkers / multi-site functionalization)
Category | CAS No. | Aladdin Cat. No. | Name | Spec / Purity | Key features & applications |
Amine building block｜Oxetanamine (rapid derivatization and library generation) | 21635-88-1 | 3-Oxetanamine | ≥97% | A primary amine that directly enters amide/urea/sulfonamide chemistry; oxetane is often used to increase polarity and hydration without significantly increasing size, supporting solubility/exposure optimization. | |
Amine building block｜Aminomethyl oxetane (for amides/ureas/sulfonamides) | 6246-05-5 | 3-(Aminomethyl)oxetane | ≥97% | A primary amine as a universal coupling handle for quickly building amide/urea/sulfonamide libraries; oxetane is often used to boost polarity and 3D character, helping solubility and conformational control. | |
Amine building block｜Tertiary-carbon amine (more 3D; pKa/conformational control) | 874473-14-0 | 3-Methyloxetan-3-amine | ≥97% | An amine adjacent to a tertiary center: used to construct more sterically congested amine side chains (controls versus linear amines or unsubstituted oxetane amines), commonly applied to tune pKa, reduce metabolism, and increase conformational restriction. | |
Alcohol building block｜Oxetane methanol (universal linker starting point) | 6246-06-6 | (Oxetan-3-yl)methanol | ≥97% | One of the most commonly used oxetane alcohol building blocks: used to make ether/ester/carbonate linkers, or for further oxidation/activation; a widely used intermediate in medicinal chemistry and materials as a “hydroxyl handle for further elaboration.” | |
Alcohol building block｜3-Hydroxyoxetane (small, polar hydroxyl entry point) | 7748-36-9 | 3-Hydroxyoxetane | ≥95% | A small hydroxyl-functionalized oxetane: used for esterification/etherification to introduce polar side chains; also common in materials end-group modification and small-molecule controls (H-bonding/polarity changes). | |
Alcohol building block｜Substituted oxetane methanol (for etherification/esterification/linkers) | 3047-32-3 | 3-Ethyl-3-oxetanemethanol | ≥96% | The alcohol handle supports ether/ester formation for linker installation; the ethyl substituent provides a size/hydrophobicity knob for structure–property comparisons and materials side-chain grafting. | |
Alcohol building block｜Methyl-substituted oxetane methanol (stereic/hydrophobic knob) | 3143-02-0 | 3-Methyl-3-oxetanemethanol | ≥97% | A substituted oxetane alcohol: retains a derivatizable hydroxyl while increasing size and hydrophobicity; commonly used for within-series structure–property controls (solubility, metabolism, conformation). | |
Diol building block｜Dihydroxymethyl oxetane (two-end linking/crosslinking/multivalent) | 2754-18-9 | [3-(Hydroxymethyl)oxetan-3-yl]methanol | ≥97% | A diol enabling two-end esterification/carbonate formation/etherification: used to build bifunctional linkers, crosslinkable units, or multivalent architectures; also common in materials end-group and network-structure design. | |
Bifunctional building block｜Bromomethyl + alcohol (stepwise installation of two functional groups) | 22633-44-9 | [3-(Bromomethyl)oxetan-3-yl]methanol | ≥97% | Contains both a halide and a hydroxyl: well-suited for stepwise linker construction (“install one end via SN2 first, then derivatize via the hydroxyl”); used to build dual-site linkers, cyclization precursors, or multifunctional probe scaffolds. |
Table 4｜Carboxylic acids / carbonyls / nitriles / boronates + polymerizable/functional monomers (conversion entry points / coupling / materials)
Category | CAS No. | Aladdin Cat. No. | Name | Spec / Purity | Key features & applications |
Carboxylic acid building block｜Oxetane-3-carboxylic acid (general amide/ester formation) | 114012-41-8 | Oxetane-3-carboxylic acid | ≥95% | One of the most commonly used oxetane acids: used for amide/ester formation and salt-form studies; often used in medicinal chemistry to “introduce an oxetane fragment while retaining an acid handle for further expansion.” | |
Carboxylic acid building block｜Quaternary-carbon acid (more congested, more hydrophobic acid handle) | 28562-68-7 | 3-Methyloxetane-3-carboxylic acid | ≥96% | A tertiary-center carboxylic acid with a more “3D / metabolism-resistant” bias: provides more rigid spatial occupancy in amide library synthesis; oxetane contributes polarity and 3D character for overall property-window optimization. | |
Carboxylic acid building block｜Side-chain-extended acid (coupling/salt-form/property window) | 1310381-54-4 | 2-(Oxetan-3-yl)acetic acid | ≥97% | A commonly used oxetane acid with a one-carbon spacer: suitable for EDC/HATU amide couplings, ester/prodrug design, and salt-form/solubility-window optimization; retains the oxetane fragment to enhance 3D character and polarity. | |
Carboxylate salt｜Lithium salt (improved aqueous solubility / easier aqueous handling) | 1416271-19-6 | lithium salt;2-(oxetan-3-yl)acetic acid | ≥97% | Lithium carboxylate salts are often more soluble in polar solvents/aqueous media: suitable for salt-form controls or as substrates in systems where free acids may cause side reactions. | |
Carbonyl building block｜Oxetane aldehyde (entry for reductive amination/condensation) | 1305207-52-6 | Oxetane-3-carbaldehyde | ≥97% | Aldehydes provide a fast entry to “attach amines”: efficient installation of oxetane side chains via reductive amination; also useful for Wittig/condensation reactions to build more complex substitution patterns. | |
Carbonyl building block｜Oxetanone (entry for reductive amination/addition) | 6704-31-0 | 3-Oxetanone | ≥95% | A classic entry point for 3-substituted oxetanes: supports reductive amination and Grignard/organometallic addition followed by downstream transformations; used to rapidly explore oxetane-containing side-chain diversity. | |
Nitrile building block｜Oxetane nitrile (versatile precursor to amide/acid/amine) | 1420800-16-3 | oxetane-3-carbonitrile | ≥97% | Nitriles are highly versatile “functional-group reserves”: can be converted into amides/carboxylic acids/amines; used to quickly expand functional-group space and property controls around an oxetane fragment. | |
Coupling building block｜Oxetane boronate ester (Suzuki cross-coupling installation of oxetane) | 1396215-84-1 | 4,4,5,5-Tetramethyl-2-(oxetan-3-yl)-1,3,2-dioxaborolane | ≥97% | A typical Suzuki coupling building block: installs an oxetane fragment onto aryl/heteroaryl partners via a C–C bond (SAR expansion; more stable carbon-framework linkage). | |
Functional monomer/intermediate｜Methoxymethylene oxetane (for further conversion/polymerization) | 1313739-05-7 | 3-(Methoxymethylene)oxetane | — | A functionalized oxetane with acetal/vinyl-ether-like character: can serve as an entry point for subsequent functional-group transformations or as a functional monomer for materials side-chain installation and structural controls. | |
Functional monomer｜Allyl-ether side-chain oxetane (post-click/grafting handle) | 3207-04-3 | 3-[(Allyloxy)methyl]-3-ethyloxetane | ≥95% | A functionalized oxetane bearing an allyl group: used in materials workflows of “polymerize/network first, then allyl post-modification” (e.g., radical addition, thiol–ene) to install dyes, adhesion motifs, or crosslinking points. | |
Polymerizable monomer｜(Meth)acrylate-functionalized oxetane (UV / free-radical curing materials) | 37674-57-0 | 3-Ethyl-3-(Methacryloyloxy)Methyloxetane | ≥96% | Acrylate/methacrylate monomers undergo free-radical polymerization: widely used in UV-curable coatings/adhesives/resin formulations; oxetane side chains are used to tune Tg, polarity, shrinkage, and mechanical performance (a commonly screened formulation monomer). |
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